from the u.s. postal service. because it's nice to have an extra pair of hands around for the holidays. of using toothpaste to clean their denture. but dentures are very different to real teeth. they're about 10 times softer and may have surface pores where bacteria can grow and multiply. polident is specifically designed to clean dentures daily. its unique micro-clean formula kills 99.9% of odor causing bacteria and helps dissolve stains, cleaning in a better way than brushing with toothpaste. that's why dentists recommend polident. [ male announcer ] polident. cleaner, fresher, brighter every day. >>> and finally tonight, we have been hearing from you all day long about something incredible we showed you last night. the tiny babies doing a kind of backstroke across a pool. you wanted to know so much more and so, here's abc's sharyn alfonsi. >> reporter: william and ellie are like most 9-month-olds. they don't walk or really talk yet. but in the water, they are anything but ordinary. swimming on their backs 25 me